Group 0

• Group zero


  The noble gases
• The original periodic table produced by Dimitri Mev did not feature group zero
• The noble gases were not fully discovered until after Mel have developed his table
• Noble gases


  • They are very unreactive elements
• Helium atom


  2 electrons in the first energy level
• Neon atom


  2 electrons in the first energy level, 8 electrons in the second energy level
• Argon atom


  8 electrons in the outer energy level
• All noble gases have a full outer energy level
• A full outer energy level makes the noble gases unreactive
• Boiling points of noble gases

  • Lower than room temperature
  • Increase as relative atomic mass increases
• Helium has the lowest boiling point, radon has the highest boiling point